CN104399370A - Lower temperature flue gas SCR (Selective Catalytic Reduction) denitration system and process - Google Patents
Lower temperature flue gas SCR (Selective Catalytic Reduction) denitration system and process Download PDFInfo
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- CN104399370A CN104399370A CN201410717085.5A CN201410717085A CN104399370A CN 104399370 A CN104399370 A CN 104399370A CN 201410717085 A CN201410717085 A CN 201410717085A CN 104399370 A CN104399370 A CN 104399370A
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Abstract
The invention provides a lower temperature flue gas SCR (Selective Catalytic Reduction) denitration system which effectively avoids catalyst inactivation, removes a heating link of flue gas, greatly reduces energy consumption and system operation cost, reduces equipment investment, solves the problem of low economic performance of a lower temperature flue gas SCR denitration technology, and saves energy sources. The SCR denitration system comprises a deduster, wherein the deduster is connected with an SCR device; an ammonia mixer is connected between the deduster and the SCR device; and the SCR device is connected with a chimney via a smoke exhaust fan. The SCR denitration system is characterized in that the SCR device is connected with a catalyst heating device. The invention provides a lower temperature flue gas SCR denitration process at the same time.
Description
Technical field
The present invention relates to the technical field of combustion product gases environmental protection treatment, be specially a kind of low-temperature smoke air SCR denitrating system and technique thereof.
Background technology
NO
xthe burning of source mainly chemical fuel, comprise coal-burning power plant, industrial furnace, motor-vehicle tail-gas etc., larger to harm.At present, SCR SCR gas denitrifying technology centering, high-temperature flue gas out of stock relatively effective, especially with NH
3for the medium and high temperature flue gas SCR denitration of reducing agent reaches its maturity.During low-temperature smoke air SCR denitration technology is researched and developed, technically also do not have maturation just at home and abroad, subject matter is that SCR catalyst is faced with SO
2with the negative effect of steam, SO
2be very easy to and NH
3reaction generates ammonium sulfate and is deposited on catalyst surface, causes catalysqt deactivation.For low-temperature flue gas NO
xremove, present method heats low-temperature flue gas exactly, improves low-temperature flue gas temperature, adapts to the temperature range of medium and high temperature flue gas SCR denitration, then selects medium and high temperature flue gas SCR denitration technology to remove NO in flue gas
x.Because heating low-temperature flue gas needs high temperature heat source, and flue gas flow is large, and energy resource consumption is very large, and system cloud gray model expense is quite high, applies very difficult, causes the utilization rate of low-temperature denitration of flue gas lower, has a strong impact on NO
xreduction of discharging.
Summary of the invention
For existing the problems referred to above, the invention provides a kind of low-temperature smoke air SCR denitrating system, effectively prevent the inactivation of catalyst, reduce the heating link of flue gas, greatly reduce energy resource consumption and system cloud gray model expense, decrease equipment investment scale, solve the problem that low-temperature smoke air SCR denitration technology economic performance is low simultaneously, save the energy, invention also provides a kind of its technique of low-temperature smoke air SCR denitration.
Its technical scheme is such, a kind of low-temperature smoke air SCR denitrating system, it comprises deduster, described deduster connects SCR reactor, ammonia blender is connected between described deduster with described SCR reactor, described SCR reactor connects chimney by smoke exhaust fan, it is characterized in that: described SCR reactor connects catalyst heating system.
A kind of low-temperature smoke air SCR denitrating technique, is characterized in that: it comprises:
(1), flue gas carries out dust removal by filtration;
(2), the catalyst in SCR reactor 2 is heated;
(3) flue gas, after dust removal by filtration mixes with ammonia and sends in SCR reactor, by SCR catalyst and ammonia generation reduction reaction, generates N
2, H
2o carries out denitration process;
(4) flue gas after the purification, produced after denitration process is got rid of from SCR reactor.
It is further characterized in that: flue gas carries out dust removal by filtration by deduster;
By catalyst heating system, the catalyst in SCR reactor is heated;
Ammonia in flue gas after dust removal by filtration and ammonia blender mixes and sends into by SCR catalyst and ammonia generation reduction reaction in SCR reactor, generates N
2, H
2o carries out denitration process;
Flue gas after the purification produced after denitration process is got rid of from SCR reactor, sends into smoke stack emission by smoke exhaust fan.
In said structure of the present invention, because SCR reactor connects catalyst heating system, catalyst is heated, effectively prevent SO
2with NH
3reaction generates ammonium sulfate and is deposited on catalyst surface, avoid the inactivation of catalyst, reduce the heating link of flue gas, decrease the flow of flue gas, the consumption of catalyst is reduced, make denitrating system equipment volume reduce, denitrating system can be made to run under low temperature, low energy consumption, save investment and operating cost, improve economic benefit and social benefit.
Accompanying drawing explanation
Fig. 1 is low-temperature smoke air SCR denitrating system schematic diagram of the present invention.
Detailed description of the invention
See Fig. 1,
A kind of low-temperature smoke air SCR denitrating system, it comprises deduster 1, deduster 1 connects SCR reactor 2, ammonia blender 3 is connected between deduster 1 with SCR reactor 2, SCR reactor 2 connects catalyst heating system 4, SCR reactor 2 connects chimney 6 by smoke exhaust fan 5, SCR reactor connects catalyst heating system 4, catalyst in SCR reactor is heated, decomposing ammonia sulfate salt, prevents ammonium sulfate from depositing at catalyst surface, slows down water vapor adsorption, accelerate water vapour desorption, be conducive to ammonia, NO
xfully contact with catalyst, under the effect of catalyst, the NO in flue gas
xwith ammonia generation reduction reaction, generate N
2, H
2o, finally removes nitrogen oxide.
The catalyst heating system that the present invention sets up, only catalyst is heated, cancel the heating of low-temperature flue gas, decrease the flow of flue gas, the consumption of catalyst is reduced, flue before and after the reduction of denitrating system equipment volume, SCR reactor and Diameter of chimney are diminished, large discharge SCR low-temperature denitration of flue gas can be adapted to.
Catalyst heating system is little more than the heater of heating low-temperature flue gas, and required to add heat few, and energy resource consumption is low.Heating runs under clean state, not only directly can heat, also can adopt indirect; Not only can heat with fuel gas buring, other thermals source of on-fuel class also can be adopted to heat.Heater stable and reliable operation long service life, the security of denitrating system is improved, and operation troubles rate reduces greatly.
See Fig. 1,
A kind of low-temperature smoke air SCR denitrating technique, is characterized in that: it comprises:
(1), flue gas carries out dust removal by filtration by deduster 1;
(2), heated by the catalyst in catalyst heating system 4 pairs of SCR reactors 2;
(3) flue gas, after dust removal by filtration and the ammonia in ammonia blender 3 mix and send into by SCR catalyst and ammonia generation reduction reaction in SCR reactor 2, generation N
2, H
2o carries out denitration process;
(4) flue gas, after the purification that produces after denitration process is got rid of from SCR reactor 2, sends into chimney 6 discharge by smoke exhaust fan 5.
The invention solves at low temperatures, eliminate SO
2with the negative effect of steam to SCR catalyst, breach the bottleneck of low-temperature smoke air SCR denitration technology, denitrating system can be made to run under low temperature, low energy consumption, save investment and operating cost, improve economic benefit and social benefit, traditional SCR flue gas denitrification system can be replaced completely.
In the present embodiment,
Deduster 1 is flue gas purifying equipment, and its inside is provided with dust arrester, carries out dedusting to the flue gas entered.Before deduster 1 is arranged in ammonia blender 3, SCR reactor 2, its import is connected with flue gas source by pipeline, export export with ammonia blender 3 respectively by pipeline, SCR reactor 2 import is connected.
Ammonia blender 2 passes into ammonia and mixes with compressed air, then enters in flue gas and also fully mixes with it.Ammonia blender 2 compressed air inlet, ammonia import are connected with respective source of the gas respectively by pipeline, and its outlet is exported with deduster 1 by pipeline, SCR reactor 3 import is connected.
There is SCR catalyst in SCR reactor 3, impel NO
xwith ammonia generation reduction reaction, remove nitrogen oxide.SCR reactor 3 gas approach is exported with deduster 1 by pipeline, ammonia blender 2 exports and is connected, and its exhanst gas outlet is connected with smoke exhaust fan 2 import by pipeline.
The built-in SCR catalyst of SCR reactor 3 is directly connected with heater 4.
Catalyst heating system 4 adopts fuel or on-fuel thermal source directly or indirectly to heat SCR catalyst.The contiguous SCR reactor 3 of catalyst heating system 4 is arranged, it is directly connected with the built-in SCR catalyst of SCR reactor 3.
Smoke exhaust fan 5 provides power for the flowing of system flue gas.Smoke exhaust fan 5 is arranged between SCR reactor 3 and chimney 6, and its import is connected with SCR reactor 3 exhanst gas outlet by pipeline, and its outlet is connected with chimney 6 import by pipeline.
Chimney 6 is tube structures.Chimney 4 import to be exported with smoke exhaust fan 5 by pipeline and is connected, and its top exhaust outlet is communicated with air.
The workflow of low-temperature smoke air SCR denitrating system of the present invention and technique thereof is described below with reference to the accompanying drawings:
Containing NO
xlow-temperature flue gas enters deduster 1 by pipeline and carries out dust removal by filtration, and the flue gas that after dedusting, dust content is up to standard mixes with the ammonia of being discharged by ammonia blender 3, is entered in SCR reactor 2 after mixing by pipeline.In SCR reactor 2, under the effect of SCR catalyst, the NO in flue gas
xwith ammonia generation reduction reaction, generate N
2, H
2o, finally removes nitrogen oxide.Flue gas after denitration discharges SCR reactor 2, then enters smoke exhaust fan 5 by pipeline, finally by smoke exhaust fan 5, the flue gas after purification is sent into chimney 6 by pipeline and discharges.
Ammonia enters ammonia blender 2 with compressed air respectively by pipeline and mixes, and is sprayed into discharged containing NO by deduster 1 after mixing by pipeline
xlow-temperature flue gas in, and fully to mix with flue gas, after mixing, enter SCR reactor 3 by pipeline.
At NO
xwith ammonia generation reduction reaction process, according to the content of low-temperature flue gas SO2 and steam, the catalyst in catalyst heating system 4 pairs of SCR reactors 3 carries out entirety heating or heat stepwise, and the activity of promoting catalyst strengthens NO
xwith the reaction of ammonia, improve out of stock efficiency.
Claims (6)
1. a low-temperature smoke air SCR denitrating system, it comprises deduster, described deduster connects SCR reactor, ammonia blender is connected between described deduster with described SCR reactor, described SCR reactor connects chimney by smoke exhaust fan, it is characterized in that: described SCR reactor connects catalyst heating system.
2. a low-temperature smoke air SCR denitrating technique, is characterized in that: it comprises:
(1), flue gas carries out dust removal by filtration;
(2), the catalyst in SCR reactor 2 is heated;
(3) flue gas, after dust removal by filtration and ammonia are sent into by SCR catalyst and ammonia generation reduction reaction in SCR reactor, generate N
2, H
2o carries out denitration process;
(4) flue gas after the purification, produced after denitration process is got rid of from SCR reactor.
3. a kind of low-temperature smoke air SCR denitrating technique according to claim 1, is characterized in that: flue gas carries out dust removal by filtration by deduster.
4. a kind of low-temperature smoke air SCR denitrating technique according to claim 1, be is characterized in that: heated the catalyst in SCR reactor by catalyst heating system.
5. a kind of low-temperature smoke air SCR denitrating technique according to claim 1, is characterized in that: the ammonia in the flue gas after dust removal by filtration and ammonia blender is sent into by SCR catalyst and ammonia generation reduction reaction in SCR reactor, generation N
2, H
2o carries out denitration process.
6. a kind of low-temperature smoke air SCR denitrating technique according to claim 1, is characterized in that: the flue gas after the purification produced after denitration process is got rid of from SCR reactor, sends into smoke stack emission by smoke exhaust fan.
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| CN201410717085.5A CN104399370A (en) | 2014-12-03 | 2014-12-03 | Lower temperature flue gas SCR (Selective Catalytic Reduction) denitration system and process |
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Cited By (4)
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|---|---|---|---|---|
| CN106512718A (en) * | 2016-11-16 | 2017-03-22 | 盐城工学院 | Method of denitration outside furnace |
| CN107014106A (en) * | 2017-03-27 | 2017-08-04 | 上海交通大学 | A kind of refrigeration based on salty compound adsorbent is with removing NOx combined cycle systems and its application |
| CN108854530A (en) * | 2018-05-23 | 2018-11-23 | 清华大学盐城环境工程技术研发中心 | A kind of wide load SCR denitration device of middle low temperature and method of denitration |
| CN112403220A (en) * | 2019-11-06 | 2021-02-26 | 中冶长天国际工程有限责任公司 | Heat exchange type flue gas denitration and decarburization treatment system and method |
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| CN107014106A (en) * | 2017-03-27 | 2017-08-04 | 上海交通大学 | A kind of refrigeration based on salty compound adsorbent is with removing NOx combined cycle systems and its application |
| CN108854530A (en) * | 2018-05-23 | 2018-11-23 | 清华大学盐城环境工程技术研发中心 | A kind of wide load SCR denitration device of middle low temperature and method of denitration |
| CN112403220A (en) * | 2019-11-06 | 2021-02-26 | 中冶长天国际工程有限责任公司 | Heat exchange type flue gas denitration and decarburization treatment system and method |
| CN112403220B (en) * | 2019-11-06 | 2022-12-06 | 中冶长天国际工程有限责任公司 | Heat exchange type flue gas denitration and decarburization treatment system and method |
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Application publication date: 20150311 |